A) \[5\,\,N\]
B) \[10\,\,N\]
C) \[15\,\,N\]
D) \[50\,\,N\]
Correct Answer: B
Solution :
\[u=0;\,\,m=10\,\,kg;\,\,t=10\,\,s\] After the force ceases, the body covers \[50\,\,m\] in\[5\,\,s\]. Therefore, the final velocity of the body, \[\text{v=}\frac{\text{Distance}}{\text{Time}}\text{=}\frac{\text{50}}{\text{5}}\text{=10}\,\,\text{m}{{\text{s}}^{\text{-1}}}\] Now, \[v=u+at\] \[\therefore \]\[10=0+a\times 10\]or\[a=1\,\,m\,\,{{s}^{-2}}\] Therefore, force applied on the body, \[F=ma=10\times 1=10\,\,N\]
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